Finding most searched keywords and competitor ads in specific region on Google Adwords?

[shortpc89]

I'm having a low CTR (0.40-1.20%) on many keywords and ads I am using on Google Adwords. I am targetting a specific region. Is there a free tool or service I can use to find keywords that most people search for in that specific region as well as competing ads shown for those keywords in that specific region? Example: If I am marketing a car rental service that sells Ford models in the Canadian region, how would I go about finding the best keywords to use for Canada for Ford car rentals as well as competing ads?
@Helen - "Try to better performance to your keywords. And very faithful Site you can do this keywords on google." Question is HOW does a person get better keywords? What strategy or tool is used? Yea, everyone uses google. But not everyone is the same. I can use "Ford car rental Canada" but not everyone will use that keyterm....maybe 25% of the Canadian community uses that term and a bigger portion uses 5 other keyterms. So the question is, what are the MOST USED keyterms? How do I find out what keyterms are most searched for?

[Helen liau]

Try to better performance to your keywords. And very faithful Site you can do this keywords on google.